[Mediastinal actinomycosis with formation of an esophagotracheal fistula. A case report].

Before antibiotics were available, actinomycosis was the most commonly diagnosed "fungal disease" of the lung because of its morphological similarity to true fungi. At that time actinomycosis presented a fairly typical clinical picture of empyema thoracis and sinus tracts in the chest wall. Nowadays it has become a rare infectious disease that is usually caused by the bacterium Actinomyces israelii and is amenable to treatment by most antibiotics available today. The following report describes the case of a 59-year-old man with an uncommon mediastinal actinomycosis that caused an oesophagotracheal fistula. This complication may develop due to the necrotizing inflammatory process that is typical for actinomycosis. With regard to the literature, the clinical manifestations of the disease and diagnostic and therapeutic considerations are discussed.